Structural analogues of the natural products magnolol and honokiol as potent allosteric potentiators of GABAA receptors
摘要:
Biphenylic compounds related to the natural products magnolol and 4'-O-methylhonokiol were synthesized, evaluated and optimized as positive allosteric modulators (PAMs) of GABA(A) receptors. The most efficacious compounds were the magnolol analog 5-ethyl-5'-hexylbiphenyl-2,2'-diol (45) and the honokiol analogs 4'-methoxy-5-propylbiphenyl-2-ol (61), 5-butyl-4'-methoxybiphenyl-2-ol (62) and 5-hexyl-4'- methoxybiphenyl-2-ol (64), which showed a most powerful potentiation of GABA-induced currents (up to 20-fold at a GABA concentration of 3 mu M). They were found not to interfere with the allosteric sites occupied by known allosteric modulators, such as benzodiazepines and N-arachidonoylglycerol. These new PAMs will be useful as pharmacological tools and may have therapeutic potential for mono-therapy, or in combination, for example, with GABA(A) receptor agonists. (C) 2014 Elsevier Ltd. All rights reserved.
precursor and characterized systematically using SEM, TEM, XRD, and XPS. NP-PdCu was demonstrated to be a competent self-supported heterogenous catalyst for Suzuki–Miyaura cross-coupling, affording a series of synthetically valuable biaryl compounds in good to excellent yields. This catalyst could be easily separated from the product via centrifugation and reused several times without obvious loss of catalytic
Aryloxide ions (Ar'O-) behave as C-nucleophiles towards diazosulfides (ArN=NSR; R = Ph, But) leading to unsymmetrical hydroxybiaryls (ArAr'OH) via C-C coupling. The reaction is particularly suited for the synthesis of terms which contain electron-withdrawing groups on the Ar moiety. The SRN1 mechanism is proposed on the grounds of experimental evidences.
Catalytic Activation of Unstrained C(Aryl)–C(Alkyl) Bonds in 2,2′-Methylenediphenols
作者:Jun Zhu、Yibin Xue、Rui Zhang、Benjamin L. Ratchford、Guangbin Dong
DOI:10.1021/jacs.1c13342
日期:2022.2.23
unstrained and nonpolar C–C bonds remains a largely unmet challenge. Here, we describe our detailed efforts in developing a rhodium-catalyzed hydrogenolysis of unstrained C(aryl)–C(alkyl) bonds in 2,2′-methylenediphenols aided by removable directing groups. Good yields of the monophenol products are obtained with tolerating a wide range of functional groups. In addition, the reaction is scalable, and
Cyclic Diaryl λ<sup>3</sup>-Chloranes: Reagents and Their C–C and C–O Couplings with Phenols <i>via</i> Aryne Intermediates
作者:Matteo Lanzi、Torben Rogge、Tan Sang Truong、K. N. Houk、Joanna Wencel-Delord
DOI:10.1021/jacs.2c10090
日期:2023.1.11
metal-free, and mild C–C and C–O couplings are reported here. Experimental and computational mechanistic studies elucidate the unprecedented reactivities and selectivities of these systems and the intermediacy of aryne intermediates. The synthetic potential of these transformations is further demonstrated via the post-functionalization of C–C and C–O coupling products obtained fromreactions of chloranes with